Hayden Raymond, center, 15, and his mother Michelle Andersen mourn the 12 victims of the mass shooting at the Aurora Century 16 movie theater during a prayer vigil at the Aurora Municipal Center, in Aurora, Colo., July 22, 2012.

At least 12 people have been killed and dozens injured at a midnight screening of The Dark Knight Rises in Denver. A 24-year-old man, James Holmes, was arrested nearby in possession of a rifle and handgun. Federal agents and police officers evacuated residents in an apartment complex after he reportedly told police that he had explosives there.